16 year old daughter and boy’s numbers

Hi Nicholeen there's a beach I allow my 16 year old daughter, who will be 17 in March, to take her siblings, 13,10,and 7 to the park after homeschool. And a teenage boy will approach her and tell her she looks good and she'll say thank you is that all? and he'll ask if they can go talk privately and she says no she's not leaving her siblings so he stands there asking for her number, if she has snap, and those kinds of things. My children have no phones of their own or any devices or social media. So she says no and he asks if he can give her his number and she says well that depends on my parents and basically tells him her parents would have to approve if they can talk, which is true. So she comes home and gives me their number and I always end up throwing the numbers away later because they curse alot, etc. This has happened many times and we are trying to navigate how to be nice but true to who we are. Should she even be accepting their phone numbers? Should I just go with them to avoid all of this? A side note, when my daughter and I did A Passport to Purity which is a biblical little getaway to giving "the talk" when she was 11, and in addition since then over the years we've discussed this, that in our family we don't do modern dating like alot of other families where teenagers hookup whenever they want and have exclusive relationships like a married couple having emotional and sexual relationships. But we do what's called courting, where you go on a date with a group of people to get to know someone you're interested in marrying. But the purpose of that is to find a spouse. At age 16 she's not ready for that either so she's allowed to do what's called traditional dating where it's the same like courting; going off in groups with someone you're interested in. There was a 15 year old boy in our homeschool coop when she was 15 who was interested in Victoria to date. We took them out to eat to Texas Roadhouse to explain to the young man those things and also said we hope they have fun and respect each other and their boundaries. But as it went along this young man was telling her on the phone very soon he loved her and would wait forever for her. But soon he tired of the fact she had to use her mother's cell phone instead of having her own to talk and that they could never have privacy so he stopped talking to her. Can you please advise me on all of this? Thank you!